Question about importing in iMovie

I just switched from a PC to a Mac, and I'm attempting to make my first video in iMovie, having previously used Windows Movie Maker. I have two questions that I hope you nice people can help me with.

1) When I was importing my video (episodes of a TV show in .mp4 format, 350 MB apiece if it matters) and I asked it to import five episodes, the first four imported properly and quickly. The fifth is taking a really long time. It says it's got 180+ minutes left to finish importing, and it's already been going for almost half an hour. I tried canceling it and restarting it, but that didn't help. I'm willing to be patient and wait if this is simply something that is normal for the program, but since it didn't do this with the first four episodes, I'm guessing this isn't normal. Any suggestions on what to do?

2) I've looked in the memories, but mostly what I've found under the iMovie section are just questions like this one or about other aspects of the program. Are there any good, basic tutorials for iMovie as a whole? Any suggestions you might have would be lovely.

Thank you for any help you can offer.

ETA: Got it. Thanks to everyone for their help. :)

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